Combined telephone and telegraph system.



No. 7|B,l86. Patented Dec. I6, I902;

12. E. BUELL.

COMBINED TELEPHONE AND TELEGRAPH SYSTEM.

(Application filed Feb. 26. 1902.]

(No Model.)

- IN VE N T05 WM (PM 6m CHARLES E. BUELL, OF CAMDEN, NEW JERSEY.

COMBINED TELEPHONE AND TELEGRAPH SYSTEM.

SPECIFICATION forming part of Letters Patent No. 716,186, dated December 16, 1902 Application filed February 26, 1902. Serial No. 95,771. (No model.) i

To all whom it may concern:

Be it known that 1, CHARLES E. BUELL, of the city and county of Camden, State of New Jersey, have invented Improvements in a Combined Telephone and Telegraph System, of which the following is a specification.

The object of my invention is to so combine apparatus for oral communication and apparatus for telephone-call signals with a main line which is used for ordinary Morse telegraphy as to admit of using the two systems successively upon the same line, with the result that small stations that are not equipped with telegraph apparatus can be equipped with the necessary apparatus for transmitting and receiving telephone-call signals and with apparatus for oral communication, and

the line, or by switch connections being pro vided for interconnecting the said line with other lines communication can be held with any desired station.

A further object of my invention is to combine a telephone apparatus with a telegraph apparatus at outlying stations where an ofiice is provided to admit of the successiveuse of the telephone and the telegraph systems over the same main line,so that during the absence of the skilled telegraph operator communications can be sent to the principal station on said line by an unskilled person by means of the telephone. I

My invention consists, primarily, in the combination, with a normally charged main line, of a series of stations, each of which is provided with a telephone set adapted to be used for oral communications when interconnected with the line, and devices at each station for sending and receiving calls from a principal 5o station and apparatus included in the main line for receiving and transmitting messages by the so-called Morse system of telegraphing, substantially as hereinafter described.

My invention further consists in certain combinations and subcombinations tobe hereinafter described. I

In the accompanying drawing the figure shows the apparatus of a combined system of telephone and telegraph for carrying out my invention.

There is shown a principal-station apparatus comprising the Morse key K and relay 7' included in a main line that is normally charged by the main battery X and grounded at E. In its normal condition the main line also includes a relay 1" at the principal station, the said relay being adjusted above the current of battery X and adapted to be inactive during the sending of messages by the make and break of the main-line circuit by the operation of the key K or other similar keys in said circuit. A vibrating hell 1) is shown as being in a local circuit. that is adapted to be closed by the attraction of armature a of the highly-adjusted relay 1' for denoting the transmission of an incoming telephone-call, as will be explained. Instead of employing a relay, as shown, an annunciator of high adjustment can be included in the circuit in place of the relay T or a visible signal can be employed in place of .the vibrating hell I).

There is shown a telephone set T in a normally disconnected branch at the principal station and a switch 3 for disconnecting the branch, which includes the relay 1" and r and the key K and main battery X and including the branch that includes the telephone set T in the mainline for oral communication.

The magneto-generator D for sending outgoing telephone-calls is shown in a derived branch with the telephone set T and adapted to be disconnected from' the main line when the receiver is removed from its support in a well-known way of alternating the magnetogenerator and the transmitter-coil and receiver in the main line.

There is also shown a fragment of a line- Wire g, havinga terminal stopj and representing another main-line connection for the purpose of interconnecting the main line shown with another similar line when desired.

ICLO

. metal and adapted to be pressed to Where awnumber of main lines radiate from a principal office equipped as described, a switchboard apparatus can be employed for interconnections in an obvious manner.

There are shown outlying stationsstation 1, station 2, and station 3each provided with a signal-transmitting key, (marked, respectively, g g q the said keys being of spring connect the charged main line to earth at E E E as the case might be, and by the grounding of said main line to increase the strength of the current of said line in its action upon the relay r' at the principal station, causing the armature a of said relay to be attracted and to denote a call upon the hell I). In this man ner telephone-calls can be transmitted from an outlying telephone-station to a principal station by means that requires no skill in transmitting the ordinary calls by the manipulation of the Morse key and admitting of the employment of theMorse key when desired at stations where such a key is provided and admitting of the locating of the telephone apparatus in a separate apartment from the telegraph apparatus at stations where a telegraph-station is maintained.

In the detailed showing of the apparatus at station 3 there is shown a transmitter at T with its induction-coil I, having its primary coil adapted to be included in a local-battery circuit when the receiving-telephone is removed from the support Z, and the said support lmakes contact with the contact-strip e and a local battery, adapting the transmitter for long-distance transmission. The lever Z is the support for the receiver, and by its passing from the contact-strips e to e e the normally excluded telephone apparatus is included in the main relay r key K and call-bell c b 3 are cut out of the main line and are again included in the main line when the receiver is again hung upon the support-lever Z.

The call-bell c b 3 is shown in a normally open branch having a terminal fand a switch 5', admitting ot' the cutting out of the relay and key 1' and K and the including of the hell 0 b 3 in the charged line when the operator is to be absent from the otfice or station 3.

There is shown a condenser 0, connected between the coils of relay '1 and adapted to prevent the discharge from said relay due to magnetic changes when the current of the main line is varied from interfering with oral communication over said line when said relay is included therein.

The showing at station 2 represents a telephone set T of well-known construction,

adapted tolong-distance transmission, with a calling-key g adapted to ground the main line at E for sending a telephone-call to the principal station to make operative the highlyadjusted call-receiving instrument r call-bell c b of station 2 is an ordinary bell adapted to respond to the action of the magneto-generator D and is arranged to be inline, and the- The" cluded in the main line when the receiver of set T is upon its support and to be excluded from said line when the said receiver is removed from said support. A condenserO is shown arranged to neutralize the discharge of said bell when the currents on the main line during oral transmission might otherwise be interfered with. V

The apparatus at station 1 is shown as consisting of the well-known form of telephone set T, arranged as in that at station 3, so that the removal of the receiver from its sup port will exclude the relay 7 and key K of the Morse set from the main line and include the telephone set T in the said line for oral communication, and by the hanging of the receiver upon its support the reverse result will occurthe telephone set will be excluded from the line and the said relay and key will be included therein. A condenser O is also shown in connection with the relay 1'.

The main line can be restored to the position shown after having been used for oral communication at the principal station by the turning of switch 8 to the position shown.

The arrangement of details can vary in the construction of the several stations shown without departing from my invention.

A resistance R is shown in line-wire to represent resistance beyond station 3 that can be out out when key g is closed to ground the line at E when it is desirable to increase the percentage-of resistance that is to be cut out for operating the telephone-call at the principal station.

The telephone sets at the principal station and at the outlying stations are all battery sets that are adapted for long-distance communication and are the same as that shown in detail at station 3.

The operation of the combined system is as follows: The telephone sets along the line are normally excluded from the charged line while the battery X is charging the main line for telegraphic transmission. When it is desired to employ the main line for oral communication, the key g for instance, is pressed, grounding the charged line at E and the relay r at the principal station attracts its armature ringing bell b. The operator at the principal station hearing the call on bell 12 turns the switch .9, disconnect-.

ing the batteryX from the main line and making contact at t' to include the telephone set T in said main line, and taking the receivingv telephone from its support asks the wishes of the person thus calling. The person calling 'having taken the receiver from its support at the outlying station where the call originated oral communication is established between the said outlying station and the principal station in the ordinary manner for oral communicating. If the outlying station desires to speak with another outlying station, the fact is communicated to the operator at the principal station, who replaces his receiver on the support and by turning magneto D to by the operator at the principal station,

and when the conversation is concluded the operator at the principal station restores the line to normal for telegraphic transmission.

It is of advantage to have the call-signals to outlying stations sent out from the principal station, as unauthorized persons are not liable to interrupt and use the line and the persons requiring to use the line for telephoning are afforded the direction of a skilled person,with results that might failof accomplishment if the attempt was made by persons who were not as familiar with the system. Moreover, lines can be interconnected at the without complicationspresent when calls are sent from severalstations.

What I claim is 1. A combined telephone and telegraph system comprising a charged line, a source of current for charging said line, a series of outlying stations along said line each provided with a transmitting-key adapted to send messages by a make and break of the circuit, a switch for said key and forming a part thereof, for cutting the key in and out of circuit, a receivinginstru ment for receiving messages sent by a make and break ofthe circuit, a telephone apparatus for each that is normally excluded from the line and switch mechanism for placing the telephone in and out of circuit, a call-receiving apparatus for each that is adapted to respond to variations of the circuit without interrupting its electric continuity, and akey for each of said stations for sending telephone-calls to a principal station on said line that arenot indicated at the said outlying stations, and apparatus at said principal station adapted to receive the incoming signals; a key and receiving instrument at the principal station for sending and receiving messages by a make and break outlying stations along said line each of which is provided with apparatus for transmitting and receiving messages bya make and break i of the circuit and also provided with apparatus for oral com municationover said line, a

key for each that is adapted to ground the said line without interrupting its continuity,

and call-receiving apparatus adapted to respond to reversals of the currentin said line, a principal station included in said line that comprises apparatus for sending and receiving messages bya make and break of the circuit,a call-receiving instrument that is adapted to respond only to an increase of current due to grounding the line, apparatus in a branch for oral communication that is adapted to be interconnected with said line, and a magneto-generator in a branch and switch devices for disconnecting the source of current normally charging the line and including the magneto-generator in said line.

3. A normally charged line that includes a principal station and aseries of outlying stations, each provided with apparatus for oral communication, and with apparatus for sending and receiving messages by a make and break of the circuit and means for neutralizing the discharge from the last-named 319-.

paratus; a call-receiving instrument at the principal station adapted to respond only to a strength of current above normal, a calling-key at each outlying station for grounding the line to make operative the said callreceiving instrument, a magneto-generator at the principal station and switch mechanism for interconnecting said generator in the line for sending outgoing-call and call-receiving apparatus at the outlying stations adapted to respond to the alternating currents of said generator.

4:. A normally charged line that includes a principal station which comprises apparatus for oral communication and apparatus for sending and receiving messages by a make and break of the circuit, a call-receiving instrument that is adjusted above normal and a magneto generator in a branch that is adapted to be interconnected in the main line; a series of outlying stations each provided with apparatus for oral communication and with apparatus for sending and receiving messages by a make and break of the circuit, condensers at the several stations adapted to neutralize the discharge from the relays in the line, and means forsending calls from said outlying stations to the principal station by varying the condition of the circuit without interrupting its continuity.

5. A normally charged main line, a series of outlying stations interconnected by said line and each provided with apparatus for sending and receiving messages by a make and break of the circuit, and with apparatus for oral communication; a call-receiving instrument at each adapted to respond to a reversal of the currents charging the line and a calltransmitting mechanism for sending calls by IIO with a call-receiving instrument adapted to respond to incoming calls produced by augmentin g the force of the current charging the line, and a call-transmitting apparatus for outgoing calls, that is adapted to change the direction of the currents charging said line.

6. A charged line that includes a principal station which comprises a Morse key, and a receiving instrument for receiving messages over said line by a make and break of the circuit, apparatus for oral communication having connection to said line, and a call-receivseries of Morse keys and instruments for receiving messagessent by a make and break of the circuit, a series of stations along said line each of which are provided with apparatus for oral communication and with devices fortransmitting call-signals without rupturingthe electrical continuity of said line, and a principal station for said line that is provided with apparatus for oral communication, and with a call-receiving instrument that is adapted to remain inactive when messages are sent over said line by a make and break of the circuit aiid to respond to call-signals that are transmitted over said line without rupturing the electrical continuity thereof,

and switch mechanism adapted to introduce the telephone apparatus in the line and to exclude the call-receiving apparatus from the line during oral communication.

8. A charged line that includes a series of telegraph-keys and receiving instruments that are adapted to transmit and receivemessages by a make and break of the circuit, a series of stations along'said line each provided with apparatus for oral comm unications, and with call-transmitting devices that are adapted to transmit telephone-call signals over said line without interrupting the continuity thereof, and a principal station for said line that is provided with a telegraph-key and receiving instrument, apparatus for oral communication, means for introducing said apparatus in and excluding it from the line, and a call-receiving apparatus that is adapted to respond only to the call-signals that are transmitted. from the outlying stations without rupturing the electrical continuity of the line and apparatus adapted to change the direction of the currents in the line for sending outgoing calls.

9. A charged line equipped for telegraphic transmission by a make and break of the circuit, a series of outlying stations each provided with apparatus for oral communication, and with a call-receiving instrument adapted to receive calls produced by reversals of the charging-currents, a principal station provided with an alternating-current generator, and switch devices for withdrawing the source of current normally charging the line and including the said generator therein.

CHARLES E. BUELL. 

